1. Scientists developed the first atomic clock in 1949.

2. The atomic clock designed according to the method has simple structure and omits a locking circuit of the traditional atomic clock, thereby improving the adaptability for the external environment.

3. The Chip Scale Atomic Clock (CSAC), originally developed for DARPA, is 100 times smaller than its predecessors and uses 100 times less power as well.

4. But new atomic clock experiments show the pace of time changes at everyday speeds and heights – when you ride a bicycle or climb a stepladder.

5. The atomic clock is accurate to one millionth of a second.

6. The loop design of the passive atomic clock is discussed to accomplish the transfer of the frequency accuracy and stability from the atomic resonance to the locked oscillator.

7. In a traditional atomic clock , atoms are illuminated by microwaves, in the gigahertz frequency range.

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8. Such a molecular or atomic clock is now being developed and promises to be very accurate.

9. The atomic clock enabled scientists to measure time with much greater accuracy.

10. These transmit coded signals containing information from highly accurate atomic clocks on board.

11. Other more recent tests involve direct comparison of the time-keeping of atomic clocks or of masers.

12. It also has the advantage of reducing many systematic effects present in atomic clocks.

13. Similarly, events can be timed to the precision of atomic clock broadcasts.

14. Concept of time in the theory of relativity is harmony with that in classic physics while paradox on the law of running change of pendulum clock and atomic clock exists.

15. The effort have been made to continue to streamline and improve the circuit to meet the requirement of the atomic clock system.